Claims that residents in Washington State and Pacific North West were/still breathing in hot particles/fuel fleas - typically around 5 per day. Tokyo residents were breathing around 10 per day in April.

http://en.wikipedia.org/wiki/Hot_particle
http://en.wikipedia.org/wiki/Fuel_fleas

http://johnkingusa.blogs.cnn.com/2011/06/07/japans-radiation-twice-as-bad/

Has anyone in the NW of the USA been noticing a metallic taste in the past few months as have been reported in Tokyo?

http://vimeo.com/25002205

It might be prudent to wear some CBRN kit if changing air filters of any kind in Seattle for example.